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path: root/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
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Diffstat (limited to 'drivers/net/ethernet/microchip/lan966x/lan966x_lag.c')
-rw-r--r--drivers/net/ethernet/microchip/lan966x/lan966x_lag.c363
1 files changed, 363 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c b/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
new file mode 100644
index 000000000000..41fa2523d91d
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
@@ -0,0 +1,363 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/if_bridge.h>
+
+#include "lan966x_main.h"
+
+static void lan966x_lag_set_aggr_pgids(struct lan966x *lan966x)
+{
+ u32 visited = GENMASK(lan966x->num_phys_ports - 1, 0);
+ int p, lag, i;
+
+ /* Reset destination and aggregation PGIDS */
+ for (p = 0; p < lan966x->num_phys_ports; ++p)
+ lan_wr(ANA_PGID_PGID_SET(BIT(p)),
+ lan966x, ANA_PGID(p));
+
+ for (p = PGID_AGGR; p < PGID_SRC; ++p)
+ lan_wr(ANA_PGID_PGID_SET(visited),
+ lan966x, ANA_PGID(p));
+
+ /* The visited ports bitmask holds the list of ports offloading any
+ * bonding interface. Initially we mark all these ports as unvisited,
+ * then every time we visit a port in this bitmask, we know that it is
+ * the lowest numbered port, i.e. the one whose logical ID == physical
+ * port ID == LAG ID. So we mark as visited all further ports in the
+ * bitmask that are offloading the same bonding interface. This way,
+ * we set up the aggregation PGIDs only once per bonding interface.
+ */
+ for (p = 0; p < lan966x->num_phys_ports; ++p) {
+ struct lan966x_port *port = lan966x->ports[p];
+
+ if (!port || !port->bond)
+ continue;
+
+ visited &= ~BIT(p);
+ }
+
+ /* Now, set PGIDs for each active LAG */
+ for (lag = 0; lag < lan966x->num_phys_ports; ++lag) {
+ struct net_device *bond = lan966x->ports[lag]->bond;
+ int num_active_ports = 0;
+ unsigned long bond_mask;
+ u8 aggr_idx[16];
+
+ if (!bond || (visited & BIT(lag)))
+ continue;
+
+ bond_mask = lan966x_lag_get_mask(lan966x, bond);
+
+ for_each_set_bit(p, &bond_mask, lan966x->num_phys_ports) {
+ struct lan966x_port *port = lan966x->ports[p];
+
+ lan_wr(ANA_PGID_PGID_SET(bond_mask),
+ lan966x, ANA_PGID(p));
+ if (port->lag_tx_active)
+ aggr_idx[num_active_ports++] = p;
+ }
+
+ for (i = PGID_AGGR; i < PGID_SRC; ++i) {
+ u32 ac;
+
+ ac = lan_rd(lan966x, ANA_PGID(i));
+ ac &= ~bond_mask;
+ /* Don't do division by zero if there was no active
+ * port. Just make all aggregation codes zero.
+ */
+ if (num_active_ports)
+ ac |= BIT(aggr_idx[i % num_active_ports]);
+ lan_wr(ANA_PGID_PGID_SET(ac),
+ lan966x, ANA_PGID(i));
+ }
+
+ /* Mark all ports in the same LAG as visited to avoid applying
+ * the same config again.
+ */
+ for (p = lag; p < lan966x->num_phys_ports; p++) {
+ struct lan966x_port *port = lan966x->ports[p];
+
+ if (!port)
+ continue;
+
+ if (port->bond == bond)
+ visited |= BIT(p);
+ }
+ }
+}
+
+static void lan966x_lag_set_port_ids(struct lan966x *lan966x)
+{
+ struct lan966x_port *port;
+ u32 bond_mask;
+ u32 lag_id;
+ int p;
+
+ for (p = 0; p < lan966x->num_phys_ports; ++p) {
+ port = lan966x->ports[p];
+ if (!port)
+ continue;
+
+ lag_id = port->chip_port;
+
+ bond_mask = lan966x_lag_get_mask(lan966x, port->bond);
+ if (bond_mask)
+ lag_id = __ffs(bond_mask);
+
+ lan_rmw(ANA_PORT_CFG_PORTID_VAL_SET(lag_id),
+ ANA_PORT_CFG_PORTID_VAL,
+ lan966x, ANA_PORT_CFG(port->chip_port));
+ }
+}
+
+static void lan966x_lag_update_ids(struct lan966x *lan966x)
+{
+ lan966x_lag_set_port_ids(lan966x);
+ lan966x_update_fwd_mask(lan966x);
+ lan966x_lag_set_aggr_pgids(lan966x);
+}
+
+int lan966x_lag_port_join(struct lan966x_port *port,
+ struct net_device *brport_dev,
+ struct net_device *bond,
+ struct netlink_ext_ack *extack)
+{
+ struct lan966x *lan966x = port->lan966x;
+ struct net_device *dev = port->dev;
+ u32 lag_id = -1;
+ u32 bond_mask;
+ int err;
+
+ bond_mask = lan966x_lag_get_mask(lan966x, bond);
+ if (bond_mask)
+ lag_id = __ffs(bond_mask);
+
+ port->bond = bond;
+ lan966x_lag_update_ids(lan966x);
+
+ err = switchdev_bridge_port_offload(brport_dev, dev, port,
+ &lan966x_switchdev_nb,
+ &lan966x_switchdev_blocking_nb,
+ false, extack);
+ if (err)
+ goto out;
+
+ lan966x_port_stp_state_set(port, br_port_get_stp_state(brport_dev));
+
+ if (lan966x_lag_first_port(port->bond, port->dev) &&
+ lag_id != -1)
+ lan966x_mac_lag_replace_port_entry(lan966x,
+ lan966x->ports[lag_id],
+ port);
+
+ return 0;
+
+out:
+ port->bond = NULL;
+ lan966x_lag_update_ids(lan966x);
+
+ return err;
+}
+
+void lan966x_lag_port_leave(struct lan966x_port *port, struct net_device *bond)
+{
+ struct lan966x *lan966x = port->lan966x;
+ u32 bond_mask;
+ u32 lag_id;
+
+ if (lan966x_lag_first_port(port->bond, port->dev)) {
+ bond_mask = lan966x_lag_get_mask(lan966x, port->bond);
+ bond_mask &= ~BIT(port->chip_port);
+ if (bond_mask) {
+ lag_id = __ffs(bond_mask);
+ lan966x_mac_lag_replace_port_entry(lan966x, port,
+ lan966x->ports[lag_id]);
+ } else {
+ lan966x_mac_lag_remove_port_entry(lan966x, port);
+ }
+ }
+
+ port->bond = NULL;
+ lan966x_lag_update_ids(lan966x);
+ lan966x_port_stp_state_set(port, BR_STATE_FORWARDING);
+}
+
+static bool lan966x_lag_port_check_hash_types(struct lan966x *lan966x,
+ enum netdev_lag_hash hash_type)
+{
+ int p;
+
+ for (p = 0; p < lan966x->num_phys_ports; ++p) {
+ struct lan966x_port *port = lan966x->ports[p];
+
+ if (!port || !port->bond)
+ continue;
+
+ if (port->hash_type != hash_type)
+ return false;
+ }
+
+ return true;
+}
+
+int lan966x_lag_port_prechangeupper(struct net_device *dev,
+ struct netdev_notifier_changeupper_info *info)
+{
+ struct lan966x_port *port = netdev_priv(dev);
+ struct lan966x *lan966x = port->lan966x;
+ struct netdev_lag_upper_info *lui;
+ struct netlink_ext_ack *extack;
+
+ extack = netdev_notifier_info_to_extack(&info->info);
+ lui = info->upper_info;
+ if (!lui) {
+ port->hash_type = NETDEV_LAG_HASH_NONE;
+ return NOTIFY_DONE;
+ }
+
+ if (lui->tx_type != NETDEV_LAG_TX_TYPE_HASH) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "LAG device using unsupported Tx type");
+ return -EINVAL;
+ }
+
+ if (!lan966x_lag_port_check_hash_types(lan966x, lui->hash_type)) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "LAG devices can have only the same hash_type");
+ return -EINVAL;
+ }
+
+ switch (lui->hash_type) {
+ case NETDEV_LAG_HASH_L2:
+ lan_wr(ANA_AGGR_CFG_AC_DMAC_ENA_SET(1) |
+ ANA_AGGR_CFG_AC_SMAC_ENA_SET(1),
+ lan966x, ANA_AGGR_CFG);
+ break;
+ case NETDEV_LAG_HASH_L34:
+ lan_wr(ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA_SET(1) |
+ ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA_SET(1) |
+ ANA_AGGR_CFG_AC_IP4_SIPDIP_ENA_SET(1),
+ lan966x, ANA_AGGR_CFG);
+ break;
+ case NETDEV_LAG_HASH_L23:
+ lan_wr(ANA_AGGR_CFG_AC_DMAC_ENA_SET(1) |
+ ANA_AGGR_CFG_AC_SMAC_ENA_SET(1) |
+ ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA_SET(1) |
+ ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA_SET(1),
+ lan966x, ANA_AGGR_CFG);
+ break;
+ default:
+ NL_SET_ERR_MSG_MOD(extack,
+ "LAG device using unsupported hash type");
+ return -EINVAL;
+ }
+
+ port->hash_type = lui->hash_type;
+
+ return NOTIFY_OK;
+}
+
+int lan966x_lag_port_changelowerstate(struct net_device *dev,
+ struct netdev_notifier_changelowerstate_info *info)
+{
+ struct netdev_lag_lower_state_info *lag = info->lower_state_info;
+ struct lan966x_port *port = netdev_priv(dev);
+ struct lan966x *lan966x = port->lan966x;
+ bool is_active;
+
+ if (!port->bond)
+ return NOTIFY_DONE;
+
+ is_active = lag->link_up && lag->tx_enabled;
+ if (port->lag_tx_active == is_active)
+ return NOTIFY_DONE;
+
+ port->lag_tx_active = is_active;
+ lan966x_lag_set_aggr_pgids(lan966x);
+
+ return NOTIFY_OK;
+}
+
+int lan966x_lag_netdev_prechangeupper(struct net_device *dev,
+ struct netdev_notifier_changeupper_info *info)
+{
+ struct lan966x_port *port;
+ struct net_device *lower;
+ struct list_head *iter;
+ int err;
+
+ netdev_for_each_lower_dev(dev, lower, iter) {
+ if (!lan966x_netdevice_check(lower))
+ continue;
+
+ port = netdev_priv(lower);
+ if (port->bond != dev)
+ continue;
+
+ err = lan966x_port_prechangeupper(lower, dev, info);
+ if (err)
+ return err;
+ }
+
+ return NOTIFY_DONE;
+}
+
+int lan966x_lag_netdev_changeupper(struct net_device *dev,
+ struct netdev_notifier_changeupper_info *info)
+{
+ struct lan966x_port *port;
+ struct net_device *lower;
+ struct list_head *iter;
+ int err;
+
+ netdev_for_each_lower_dev(dev, lower, iter) {
+ if (!lan966x_netdevice_check(lower))
+ continue;
+
+ port = netdev_priv(lower);
+ if (port->bond != dev)
+ continue;
+
+ err = lan966x_port_changeupper(lower, dev, info);
+ if (err)
+ return err;
+ }
+
+ return NOTIFY_DONE;
+}
+
+bool lan966x_lag_first_port(struct net_device *lag, struct net_device *dev)
+{
+ struct lan966x_port *port = netdev_priv(dev);
+ struct lan966x *lan966x = port->lan966x;
+ unsigned long bond_mask;
+
+ if (port->bond != lag)
+ return false;
+
+ bond_mask = lan966x_lag_get_mask(lan966x, lag);
+ if (bond_mask && port->chip_port == __ffs(bond_mask))
+ return true;
+
+ return false;
+}
+
+u32 lan966x_lag_get_mask(struct lan966x *lan966x, struct net_device *bond)
+{
+ struct lan966x_port *port;
+ u32 mask = 0;
+ int p;
+
+ if (!bond)
+ return mask;
+
+ for (p = 0; p < lan966x->num_phys_ports; p++) {
+ port = lan966x->ports[p];
+ if (!port)
+ continue;
+
+ if (port->bond == bond)
+ mask |= BIT(p);
+ }
+
+ return mask;
+}
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